Legal claims defining the scope of protection. Each claim is shown in both the original legal language and a plain English translation.
1. A gamma correction circuit, comprising: a first input amplifier configured to output a maximum voltage when receiving a first reference voltage; a second input amplifier configured to output a minimum voltage when receiving a second reference voltage; a third input amplifier configured to output a highest gamma voltage when receiving the first reference voltage, wherein the first and third input amplifiers share a first input terminal; and a fourth input amplifier configured to output a lowest gamma voltage when receiving the second reference voltage, wherein the second and fourth input amplifiers share a second input terminal, wherein the first input amplifier and the second input amplifier are deactivated when the display driving device operates in an always on display (AOD) mode.
This invention relates to a gamma correction circuit for display systems, addressing the need for efficient power management in devices with always-on display (AOD) modes. The circuit includes four input amplifiers: a first amplifier outputs a maximum voltage when receiving a first reference voltage, while a second amplifier outputs a minimum voltage when receiving a second reference voltage. A third amplifier, sharing an input terminal with the first amplifier, outputs the highest gamma voltage when receiving the first reference voltage. Similarly, a fourth amplifier, sharing an input terminal with the second amplifier, outputs the lowest gamma voltage when receiving the second reference voltage. In AOD mode, the first and second amplifiers are deactivated to reduce power consumption while maintaining display functionality. The shared input terminals optimize circuit design by reducing redundancy, ensuring accurate gamma correction across the display's voltage range. This configuration balances performance and energy efficiency, particularly in low-power display applications.
2. The circuit of claim 1 , further comprising a first resistor column configured to receive the maximum voltage from the first input amplifier and the minimum voltage from second input amplifier, wherein the first resistor column distributes the maximum voltage and the minimum voltage, and the circuit further comprises a decoder configured to output a voltage from voltages distributed by the first resistor column.
This invention relates to a voltage distribution circuit used in analog-to-digital conversion or signal processing systems. The problem addressed is the need for precise voltage distribution between a maximum voltage from a first input amplifier and a minimum voltage from a second input amplifier, ensuring accurate signal representation in subsequent stages. The circuit includes a first resistor column connected to receive the maximum voltage from the first input amplifier and the minimum voltage from the second input amplifier. The resistor column distributes these voltages across its nodes, creating a range of intermediate voltages. A decoder is also included to select and output a specific voltage from the distributed voltages based on control signals. This allows for precise voltage selection, which is critical in applications requiring high-resolution signal conversion or processing. The resistor column ensures uniform voltage distribution, while the decoder enables dynamic selection of the desired voltage level. This combination improves accuracy and flexibility in voltage selection, making the circuit suitable for high-performance analog-to-digital converters or other precision voltage applications. The design minimizes signal distortion and enhances reliability in voltage distribution tasks.
3. The circuit of claim 2 , further comprising an output amplifier configured to receive the voltage from the decoder.
A circuit for processing signals includes a decoder that converts an input signal into a voltage, where the decoder is designed to reduce power consumption by operating in a low-power mode when the input signal is inactive. The circuit further includes an output amplifier that receives the voltage from the decoder and amplifies it to produce an output signal. The output amplifier is configured to maintain signal integrity while minimizing additional power consumption. The decoder may use a differential input stage to improve noise immunity and accuracy, and it may include a feedback mechanism to adjust its operating parameters dynamically. The output amplifier may incorporate a gain control feature to adjust the amplification level based on the input signal characteristics. The overall circuit is designed for applications requiring efficient signal processing with low power consumption, such as in portable or battery-powered devices. The combination of the decoder and output amplifier ensures reliable signal conversion and amplification while optimizing energy efficiency.
4. The circuit of claim 3 , wherein the output amplifier includes a first output amplifier to a fifth output amplifier, wherein the first output amplifier to the fifth output amplifier output gamma voltages that (i) exceed or are higher than the lowest gamma voltage, (ii) are less than the highest gamma voltage, and (iii) differ from each other.
This invention relates to a circuit for generating gamma voltages used in display systems, particularly for liquid crystal displays (LCDs). The problem addressed is the need for precise and stable gamma voltage generation to ensure accurate grayscale representation in displays. Traditional gamma voltage generation circuits often suffer from inaccuracies or require complex calibration. The circuit includes multiple output amplifiers, specifically a first to a fifth output amplifier, each generating distinct gamma voltages. These voltages are intermediate levels between the lowest and highest gamma voltages in the display system. The output amplifiers ensure that the generated gamma voltages are stable and accurately reflect the intended grayscale levels. The circuit may also include a reference voltage generator to provide stable reference levels for the output amplifiers, and a voltage divider network to distribute the reference voltages across the amplifiers. The output amplifiers are designed to minimize noise and distortion, ensuring consistent gamma voltage output. This configuration allows for precise control over the display's grayscale performance, improving image quality and reducing the need for frequent calibration. The invention is particularly useful in high-resolution and high-contrast display applications where accurate gamma correction is critical.
5. The circuit of claim 3 , wherein the output amplifier is deactivated when the display driving device operates in the AOD mode.
A display driving device includes a circuit for managing power consumption during an always-on display (AOD) mode. The circuit comprises an output amplifier and a control module. The control module detects the operating mode of the display and deactivates the output amplifier when the device operates in AOD mode to reduce power consumption. The output amplifier is reactivated when the display transitions to a normal mode. The control module may include a mode detection circuit that identifies the current display mode and a switching circuit that disables the output amplifier in response to the AOD mode detection. The circuit ensures efficient power management by minimizing unnecessary amplifier operation during low-power AOD operation while maintaining full functionality in normal mode. This design is particularly useful for mobile devices where power efficiency is critical.
6. The circuit of claim 3 , further comprising a second resistor column configured to receive a gamma voltage from the output amplifier.
A circuit for driving a display panel includes a first resistor column connected to a digital-to-analog converter (DAC) to generate a reference voltage. The circuit further includes a second resistor column connected to an output amplifier, which receives a gamma voltage from the output amplifier. The gamma voltage is used to adjust the voltage levels applied to the display panel, ensuring accurate grayscale representation. The first resistor column and the second resistor column work together to provide precise voltage scaling and compensation, improving display uniformity and color accuracy. The output amplifier supplies the gamma voltage to the second resistor column, allowing dynamic adjustment of the voltage levels based on input signals. This configuration enhances the performance of the display driver circuit by maintaining consistent voltage levels across different operating conditions. The circuit is particularly useful in high-resolution display applications where precise voltage control is critical.
7. The circuit of claim 6 , wherein the second resistor column generates a grayscale voltage based on or in response to the gamma voltage, and output terminals of the third input amplifier and the fourth input amplifier are not electrically connected to the first resistor column and the second resistor column.
This invention relates to a circuit for generating grayscale voltages in display systems, addressing the need for precise voltage control in gamma correction. The circuit includes multiple resistor columns and input amplifiers to produce accurate grayscale voltages while maintaining electrical isolation between components. A first resistor column generates a reference voltage, while a second resistor column produces a grayscale voltage in response to a gamma voltage. The circuit also features a third and fourth input amplifier, whose output terminals are not electrically connected to the resistor columns, ensuring signal integrity and reducing interference. This design improves voltage stability and accuracy in display applications by preventing direct electrical coupling between the amplifiers and resistor columns, which can degrade performance. The invention is particularly useful in high-resolution displays requiring precise gamma correction to achieve optimal image quality. The isolated configuration of the amplifiers and resistor columns enhances reliability and reduces signal distortion, making it suitable for advanced display technologies.
8. The circuit of claim 1 , wherein the first input amplifier stops outputting the maximum voltage when the first input amplifier is deactivated, the second input amplifier stops outputting the minimum voltage when the second input amplifier is deactivated, the maximum voltage and the highest gamma voltage are the same, and the minimum voltage and the lowest gamma voltage are the same.
This invention relates to a circuit for generating gamma voltages used in display systems, particularly for controlling input amplifiers that produce reference voltages for display panel driving. The problem addressed is ensuring precise and stable gamma voltage generation while minimizing power consumption and complexity. The circuit includes first and second input amplifiers that generate a maximum voltage and a minimum voltage, respectively. When deactivated, the first input amplifier ceases to output the maximum voltage, and the second input amplifier ceases to output the minimum voltage. The maximum voltage matches the highest gamma voltage required for display operation, and the minimum voltage matches the lowest gamma voltage. This design ensures that the gamma voltages remain accurate and stable while reducing power usage when the amplifiers are inactive. The circuit may also include a voltage divider network to generate intermediate gamma voltages between the maximum and minimum values, ensuring smooth grayscale transitions in the display. The amplifiers are controlled by activation signals to dynamically adjust the gamma voltage range based on display requirements, optimizing power efficiency. This approach simplifies the circuit design while maintaining precise voltage levels for display panel operation.
9. A gamma correction circuit, comprising: a first input amplifier and a third input amplifier configured to receive a first reference voltage; a second input amplifier and a fourth input amplifier configured to receive a second reference voltage; a first resistor column configured to receive and distribute voltages from the first input amplifier and the second input amplifier; a decoder configured to output one or more of the voltages distributed by the first resistor column; a plurality of output amplifiers configured to receive the one or more voltages from the decoder, and output voltages that exceed or are higher than a voltage from the fourth input amplifier and less than a voltage from the third input amplifier; and a second resistor column configured to generate grayscale voltages based on or in response to the voltages from the plurality of output amplifiers, wherein output terminals of the third input amplifier and the fourth input amplifier are not electrically connected to the first resistor column or the second resistor column, and the first input amplifier, the second input amplifier, and the plurality of output amplifiers are deactivated when the display driving device operates in an always on display (AOD) mode.
This invention relates to a gamma correction circuit used in display driving devices, particularly for improving power efficiency in always-on display (AOD) mode. The circuit addresses the challenge of reducing power consumption while maintaining accurate grayscale voltage generation for display panels. The circuit includes two input amplifiers receiving reference voltages, with a first pair (first and second input amplifiers) connected to a resistor column that distributes voltages. A decoder selects and outputs specific voltages from this column, which are then amplified by a set of output amplifiers. These amplified voltages are fed into a second resistor column to generate precise grayscale voltages for the display. The third and fourth input amplifiers, which provide upper and lower voltage bounds, are isolated from the resistor columns to prevent unnecessary power draw. In AOD mode, the first and second input amplifiers and the output amplifiers are deactivated to minimize power consumption, while the third and fourth input amplifiers remain active to maintain basic display functionality. This selective deactivation ensures efficient power management without compromising display performance. The design optimizes energy use in low-power display states while supporting full grayscale accuracy in normal operation.
10. The circuit of claim 9 , wherein the first input amplifier outputs a maximum voltage to the first resistor column and the second resistor column when the first input amplifier is active, and the second input amplifier outputs a minimum voltage to the first resistor column and the second resistor column when the second input amplifier is active.
This invention relates to a circuit design for controlling voltage distribution in a resistor network. The problem addressed is the need for precise voltage regulation in circuits where multiple resistor columns are driven by different input amplifiers, ensuring stable and predictable voltage levels across the network. The circuit includes a first input amplifier and a second input amplifier, each connected to a first resistor column and a second resistor column. When the first input amplifier is active, it outputs a maximum voltage to both resistor columns, ensuring full voltage distribution. Conversely, when the second input amplifier is active, it outputs a minimum voltage to both resistor columns, effectively grounding or minimizing the voltage. This alternating control mechanism allows for dynamic voltage switching between the amplifiers, enabling efficient power management and signal integrity in the resistor network. The design ensures that only one amplifier is active at a time, preventing conflicts and maintaining stable voltage levels. The first and second resistor columns are configured to receive the output voltages from the amplifiers, allowing for controlled resistance and voltage division. This configuration is particularly useful in applications requiring precise voltage regulation, such as analog signal processing, power management, or sensor interfacing. The circuit's simplicity and effectiveness make it suitable for integration into various electronic systems where reliable voltage control is critical.
11. The circuit of claim 9 , wherein the third input amplifier outputs a highest gamma voltage when the first reference voltage is input, and the fourth input amplifier outputs a lowest gamma voltage when the second reference voltage is input.
This invention relates to a circuit for generating gamma voltages in display systems, addressing the need for precise voltage levels to control display brightness and color accuracy. The circuit includes multiple input amplifiers that receive reference voltages and produce corresponding gamma voltages, which are essential for adjusting the grayscale levels in display panels. The circuit features a first input amplifier that outputs a gamma voltage based on a first reference voltage, and a second input amplifier that outputs a gamma voltage based on a second reference voltage. Additionally, a third input amplifier is configured to output the highest gamma voltage when the first reference voltage is applied, while a fourth input amplifier outputs the lowest gamma voltage when the second reference voltage is applied. This ensures that the display system can achieve the full dynamic range of brightness levels, from the brightest to the dimmest, with precise control. The circuit may also include a voltage divider network that generates intermediate gamma voltages between the highest and lowest levels, ensuring smooth transitions across the grayscale spectrum. The amplifiers are designed to maintain stability and accuracy, even under varying operating conditions, to prevent flickering or color distortion in the display. This solution is particularly useful in high-resolution displays where precise gamma correction is critical for image quality.
12. The circuit of claim 9 , wherein the plurality of output amplifiers includes a first output amplifier to a fifth output amplifier, and the first output amplifier to the fifth output amplifier output gamma voltages that exceed or are higher than a voltage from the fourth input amplifier and are less than a voltage from the third input amplifier.
This invention relates to a circuit for generating gamma voltages used in display systems, particularly for liquid crystal displays (LCDs). The problem addressed is the need for precise voltage generation to ensure accurate grayscale representation in displays, which is critical for image quality. The circuit includes multiple input amplifiers and output amplifiers. The input amplifiers receive reference voltages and generate intermediate voltages. The output amplifiers then produce gamma voltages based on these intermediate voltages. Specifically, the output amplifiers include a first to a fifth output amplifier, each generating distinct gamma voltages. These gamma voltages are constrained to be higher than the voltage from a fourth input amplifier but lower than the voltage from a third input amplifier. This ensures the gamma voltages fall within a specific range, allowing for fine-tuned control of the display's grayscale levels. The circuit's design enables precise voltage generation by leveraging the hierarchical amplification stages, where the input amplifiers set the voltage boundaries, and the output amplifiers refine the gamma voltages within those boundaries. This approach improves display performance by maintaining accurate voltage levels across different grayscale values, enhancing image quality and consistency. The invention is particularly useful in high-resolution displays where precise voltage control is essential.
13. A gamma correction method for providing a gamma voltage output to a display driving device from a gamma correction circuit, the method comprising: deactivating a first input amplifier and a second input amplifier of the gamma correction circuit when the display driving device operates in an always on display (AOD) mode; deactivating a first output amplifier to a fifth output amplifier of the gamma correction circuit when the display driving device operates in the AOD mode; and outputting a highest gamma voltage and a lowest gamma voltage from a third input amplifier and a fourth input amplifier of the gamma correction circuit when the driving device operates in the AOD mode.
This invention relates to gamma correction techniques for display driving devices, specifically addressing power efficiency in always-on display (AOD) modes. Gamma correction circuits typically use multiple input and output amplifiers to adjust voltage levels for display brightness and contrast. However, in AOD mode, where the display operates at minimal brightness, most amplifiers are unnecessary, leading to wasted power. The method optimizes power consumption by selectively deactivating amplifiers in AOD mode. When the display operates in AOD mode, the first and second input amplifiers, as well as the first through fifth output amplifiers, are deactivated to reduce power usage. Instead, only the third and fourth input amplifiers remain active, generating the highest and lowest gamma voltages required for minimal display operation. This selective deactivation ensures that only essential amplifiers function, significantly reducing power consumption while maintaining display functionality in low-power states. The approach is particularly useful for battery-powered devices where energy efficiency is critical.
14. The method of claim 13 , wherein outputting the highest gamma voltage and the lowest gamma voltage includes: outputting the highest gamma voltage from the third input amplifier when a first reference voltage is input; and outputting the lowest gamma voltage from the fourth input amplifier when a second reference voltage is input.
This invention relates to a method for generating gamma voltages in a display system, specifically addressing the need for precise control of gamma voltage levels to improve display quality. The method involves using multiple input amplifiers to generate distinct gamma voltages, ensuring accurate voltage levels for display panel operation. The method includes outputting a highest gamma voltage and a lowest gamma voltage from separate input amplifiers. The highest gamma voltage is generated by a third input amplifier when a first reference voltage is applied, while the lowest gamma voltage is generated by a fourth input amplifier when a second reference voltage is applied. This approach allows for independent control of the highest and lowest gamma voltages, improving display linearity and color accuracy. The method also involves generating intermediate gamma voltages using additional input amplifiers, with each amplifier receiving a corresponding reference voltage to produce a specific gamma voltage level. The use of multiple amplifiers ensures stable and precise voltage outputs, reducing distortion and enhancing display performance. The method is particularly useful in high-resolution displays where accurate gamma correction is critical for image quality.
15. The method of claim 13 , wherein when the display driving device operates in a mode other than the AOD mode, the method further comprises: activating the first input amplifier and the second input amplifier of the gamma correction circuit; and activating the first output amplifier to the fifth output amplifier of the gamma correction circuit.
This invention relates to display driving circuits, specifically gamma correction circuits used in display systems. The problem addressed is the power efficiency of gamma correction circuits, particularly in always-on display (AOD) modes where full functionality is unnecessary. Gamma correction circuits adjust the voltage levels of display signals to ensure accurate color representation, but conventional designs consume significant power even when only partial functionality is needed. The invention describes a method for dynamically adjusting the operation of a gamma correction circuit based on the display mode. In AOD mode, only a subset of input and output amplifiers are activated to reduce power consumption. When operating in non-AOD modes, the method activates all input and output amplifiers of the gamma correction circuit to ensure full functionality. The gamma correction circuit includes multiple input amplifiers and output amplifiers, where the first and second input amplifiers and the first through fifth output amplifiers are selectively activated depending on the display mode. This selective activation allows the display system to balance power efficiency and performance based on the operational requirements of the display mode. The invention improves energy efficiency in display systems without compromising image quality when full functionality is required.
16. The method of claim 15 , wherein when the display driving device operates in the mode other than the AOD mode, the method further comprises: outputting a maximum voltage from the first input amplifier; and outputting a minimum voltage from the second input amplifier, and the maximum voltage and the highest gamma voltage are the same, and the minimum voltage and the lowest gamma voltage are the same.
This invention relates to display driving techniques, specifically for managing voltage outputs in different operating modes of a display system. The problem addressed is optimizing power efficiency and performance in displays that support multiple modes, such as Always-On Display (AOD) and normal operation modes. In AOD mode, the display may show minimal information with reduced power consumption, while in other modes, full functionality is required. The method involves a display driving device that adjusts voltage outputs based on the operating mode. When not in AOD mode, the device outputs a maximum voltage from a first input amplifier and a minimum voltage from a second input amplifier. These voltages are synchronized with gamma correction voltages, ensuring the maximum voltage matches the highest gamma voltage and the minimum voltage matches the lowest gamma voltage. This alignment improves display performance by maintaining consistent brightness and color accuracy while optimizing power usage. The technique ensures seamless transitions between modes without compromising image quality or efficiency. The solution is particularly useful in mobile devices and other power-sensitive applications where display performance and battery life are critical.
17. The method of claim 16 , wherein outputting the maximum voltage comprises providing the maximum voltage to a first resistor column and a second resistor column, and outputting the minimum voltage comprises providing the minimum voltage output to the first resistor column and the second resistor column.
This invention relates to voltage regulation in electronic circuits, specifically addressing the challenge of efficiently distributing voltage levels to multiple resistor columns. The method involves generating a maximum voltage and a minimum voltage, then supplying these voltages to at least two resistor columns. The maximum voltage is provided to both a first resistor column and a second resistor column, while the minimum voltage is also supplied to both the first and second resistor columns. This approach ensures consistent voltage distribution across multiple resistive loads, improving circuit stability and performance. The method may be part of a larger voltage regulation system that includes generating the voltage levels and managing their distribution to ensure proper operation of connected components. By coordinating the supply of both maximum and minimum voltages to the resistor columns, the invention optimizes power delivery and reduces potential voltage imbalances, enhancing overall system reliability. The technique is particularly useful in applications requiring precise voltage control, such as analog circuits, sensor interfaces, or power management systems.
18. The method of claim 17 , wherein when the display driving device operates in the mode other than the AOD mode, the method further comprises: distributing the maximum voltage and the minimum voltage in the first resistor column; and outputting from a decoder a voltage from the distributed voltages.
A method for driving a display device, particularly for managing power consumption and voltage distribution in a display system. The invention addresses the challenge of efficiently controlling display voltages to optimize power usage, especially in low-power or ambient display modes. The method involves distributing a maximum voltage and a minimum voltage across a first resistor column to generate a range of intermediate voltages. These distributed voltages are then selectively output by a decoder to drive the display. The method is particularly useful when the display is operating in a mode other than an Always-On Display (AOD) mode, where dynamic voltage control is required to balance performance and power efficiency. The resistor column provides a scalable voltage distribution mechanism, while the decoder ensures precise voltage selection for display driving. This approach enhances energy efficiency by dynamically adjusting voltages based on operational requirements, reducing unnecessary power consumption while maintaining display functionality. The method integrates seamlessly with existing display driving systems, offering a flexible solution for voltage management in various display applications.
19. The method of claim 18 , wherein when the display driving device operates in the mode other than the AOD mode, the method further comprises: receiving the voltage from the decoder by a plurality of output amplifiers; and outputting gamma voltages from the plurality of output amplifiers that are higher than or exceed the lowest gamma voltage and are less than the highest gamma voltage, and the gamma voltages differ from each other.
This invention relates to display driving techniques, specifically for managing gamma voltage output in different display modes. The problem addressed is the need for efficient and flexible gamma voltage generation in displays, particularly when transitioning between active display modes and always-on display (AOD) modes. In AOD mode, the display typically operates at reduced power and brightness, requiring specialized voltage handling. The invention provides a method for dynamically adjusting gamma voltage output based on the display's operating mode. When the display is not in AOD mode, the method involves receiving a voltage from a decoder using multiple output amplifiers. These amplifiers generate distinct gamma voltages that are higher than the lowest gamma voltage but lower than the highest gamma voltage, ensuring precise control over display brightness and color accuracy. The method ensures that the gamma voltages are tailored to the active display mode, optimizing performance and power efficiency. This approach allows for seamless transitions between display modes while maintaining high-quality visual output. The invention is particularly useful in devices requiring both high-performance display operation and energy-efficient AOD functionality.
20. The method of claim 19 , wherein when the display driving device operates in the mode other than the AOD mode, the method further comprises: generating grayscale voltages in the second resistor column based on or in response to the gamma voltages from the plurality of output amplifiers; and outputting the grayscale voltages from the second resistor column.
This invention relates to display driving devices, specifically for systems that support both Always-On Display (AOD) mode and other display modes. The problem addressed is the need for efficient voltage generation in display systems that must switch between different operating modes, particularly when transitioning from AOD mode to other modes. The invention describes a method for operating a display driving device that includes a first resistor column and a second resistor column. In AOD mode, the device generates grayscale voltages using the first resistor column, which is optimized for low-power operation. When the device switches to a mode other than AOD, the method involves generating grayscale voltages in the second resistor column based on gamma voltages provided by a plurality of output amplifiers. These grayscale voltages are then output from the second resistor column. The second resistor column is designed to handle higher performance requirements compared to the first resistor column, ensuring accurate voltage generation for non-AOD modes. The method ensures seamless switching between modes while maintaining display quality and power efficiency.
Unknown
September 1, 2020
Browse 5M+ US patents with plain-English claim translations and AI-generated analysis.